HT1151 FireWire and USB issue - writing to external drives stalls

I've started having a problem with external attached drives both USB and Firewire.
Any operation that attempts to write large ammounts of data over those prots simply stalls at some point in time, for instance TimeMachine or 4GB iso
I've followed http://support.apple.com/kb/HT1151 but have not been able to get to working solution.
All drives tested are working correctly on another MBP machine, I can copy few GB of information easily and speedy
I've attempted to use clear user account, getting same failure
Drive is allways detected when plugged in  under all accounts I have tried.
Same problems I have expirienced on Snow Leopard and Mountain Lion, I'm using mid 2010 15" MBP
Question is what log files should one examine in attempt to troublshoot the problem?
========================
  Model Name:          MacBook Pro
  Model Identifier:          MacBookPro6,2
  Processor Name:          Intel Core i7
  Processor Speed:          2,66 GHz
  Number of Processors:          1
  Total Number of Cores:          2
  L2 Cache (per Core):          256 KB
  L3 Cache:          4 MB
  Memory:          8 GB
  Processor Interconnect Speed:          4.8 GT/s
  Boot ROM Version:          MBP61.0057.B0F
  SMC Version (system):          1.58f16
FireWire Bus:
  Maximum Speed:          Up to 800 Mb/sec

This seams to be related to Firewire port only, I just switched to using usb extention cord on the same drive and its omovign information happly on both USB ports....
So question is how does one check health of the Firewire port and associated driveres, which logs to monitor and what information is prudent?

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